论文部分内容阅读
我国北方风沙危害的主要防治区包括贺兰山以东沙地和以西的沙漠、绿洲和沙漠与荒漠草原过渡区,约3.2×105 km2.植被重建与恢复是该区遏制风沙危害的重要手段和有效的途径.基于腾格里沙漠沙坡头地区50余年的长期生态学研究,发现重建植被通过对土壤水分的利用和时空再分配改变了原来沙丘系统的水循环特征,在给定的区域降水条件下,土壤水的时空动态与重建植被动态密切相关;指出沙区水文过程的长期改变驱动着人工植被的演替;探讨了降水小于200 mm风沙区土壤水分的植被承载力和植物固沙的模式.
The main control areas for the wind and sand hazards in the north of China include deserts and oases in the east of the Helan Mountains and the desert and grassland transitional zone of the west, about 3.2 × 10 5 km 2. Vegetation reconstruction and restoration are important means and effective ways to curb the hazards of sandstorms in the area Based on more than 50 years of long-term ecological studies in the Shapotou region of the Tengger Desert, it was found that the rehabilitated vegetation changed the water cycle characteristics of the original dune system through the use of soil moisture and space-time redistribution. Under a given regional rainfall condition, soil The spatio-temporal dynamics of water is closely related to vegetation dynamics. It is pointed out that the long-term changes of hydrological processes in sandy areas drive the succession of artificial vegetation. The bearing capacity of soil moisture and the mode of plant sand fixation are discussed.